51868

Appears in sequences

• [ (4th elementary symmetric function of S(n))/(2nd elementary symmetric of S(n)) ], where S(n) = {3,4, ..., n+5}.at n=35A024194
• Let M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n; then a(n) is the trace of M(n)^(-7).at n=16A114359
• Related to number of mesh patterns of length 2 that avoid the pattern 231 or 321. For details see the comment section.at n=11A289450